基于地层层序表集的三维地层建模方法研究

钻孔样本间因存在地层层序不一致而导致无法确定建模时各地层拓扑关系，是采用钻孔数据建立三维地质模型的难点。拟通过下述方法解决这一难点：在已知的主地层层序表情况下，由主地层层序表结合钻孔信息推测出其他地层层序表，建立地层层序表集，再通过运用空间分析的手段来确定钻孔样本与各张地层层序表的归属关系，采用最大数目地层连接法来自动确定两个地层层序表间相互连接关系，并得到合并表；然后结合这种连接法，将全部地层层序表合并为一张最终地层层序表，从而确定所有地层拓扑关系；所有钻孔数据按照最终表进行标准化，之后运用表面建模方法进行三维地层建模。在诸永高速公路K120+030～K120+300段滑坡区域的三维地层建模中，运用该方法验证了其有效性。

Modelling 3D strata guided by tables of stratigraphic sequences

It is difficult for modelling 3D strata if different stratigraphic sequences exist among the boreholes. The problem can be solved through following method: deducing the inferior tables of stratigraphic sequences from the main table of stratigraphic sequences which is provided by the survey data with the information of the boreholes, have different stratigraphic sequences from the main table, is the first step. The main table and the other tables become a group of tables of stratigraphic sequences. The relationship that a borehole belongs to which table of the group can find out by using spatial probability analysis and the corresponding relationships between boreholes and tables then are set up. The problems of connecting the boreholes which have different stratigraphic sequences change into the problem of connecting the different tables. A technique that can be used to automatically figure out the corresponding relationship between two tables by searching for maximum count of same stratum is put forward. With this technique, all the tables in the group can be combined into a final table. Basing on it, the algorithm for building layer model is set up. At last, the validation of this algorithm is proved by using it in modelling 3D strata of the slope at Zhu-Yong expressway section K120+030~K120+300.